/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.iotdb.db.queryengine.plan.relational.planner.node;

import org.apache.iotdb.db.queryengine.plan.planner.plan.node.PlanNode;

import java.util.List;

public final class ChildReplacer {
  private ChildReplacer() {}

  /** Return an identical copy of the given node with its children replaced */
  public static PlanNode replaceChildren(PlanNode node, List<PlanNode> children) {
    for (int i = 0; i < node.getChildren().size(); i++) {
      if (children.get(i) != node.getChildren().get(i)) {
        return node.replaceChildren(children);
      }
    }
    return node;
  }
}
